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An ordered pair is a simple way of keeping track of two numbers by writing them in a specific order. Learn about ordered pairs and how they are useful. Calculus: Tutoring Solution / Math Courses
Relation definition. A relation between two sets is a collection of ordered pairs containing one object from each set. If the object $x$ is from the first set and the object $y$ is from the second set, then the objects are said to be related if the ordered pair $(x,y)$ is in the relation.